There is going to be metal removed from the jug no matter what...and IMHO the secret is not to simply promote this initial metal removal, but rather to possibly control what happens when these asperities are being removed.
During the mating of the peaks, severe micro-heating occurs. And without proper lubrication, the result could be the metal surrounding the asperities going to weld, and also being gouged and ripped away, leaving a less than desirable surface.
A better lubricant can help to ease the severity of the tearing of asperities, and leave the surrounding metal more intact.
An even better sort of lubricant or rebuild fluid could actually change the way the molecules react when being torn, allowing for the best possible surface condition, yet still allowing the other mechanisms to take place.
That is why some mfg's provide a rebuild fluid specifically for such events. Many are chock full of moly...some have none and use different mechanisms.
I'm curious if this is the first run with this engine? Can you see a drop in performance that is in line with the leak-down readings? In other words...did you have more HP when you were holding more pressure?
I ask because I think many use the leak-down of a rebuild as a "tell-all", when I think it is only one small thing to look at. Especially when the rate can be manipulated somewhat by the ring end gap, or use of a fancy ring.